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package protocols.implementations;
import java.util.ArrayList;
import java.util.Vector;
import core.VSMessage;
import protocols.VSAbstractProtocol;
/**
* The class VSReliableMulticastProtocol, an implementation of the reliable
* multicast protocol.
*
* @author Paul C. Buetow
*/
public class VSReliableMulticastProtocol extends VSAbstractProtocol {
/**
* Instantiates a two phase commit protocol object.
*/
public VSReliableMulticastProtocol() {
super(VSAbstractProtocol.HAS_ON_CLIENT_START);
setClassname(getClass().toString());
}
/** PIDs of all processes which still have to send an ACK */
private ArrayList<Integer> pids;
/* (non-Javadoc)
* @see events.VSAbstractProtocol#onClientInit()
*/
public void onClientInit() {
Vector<Integer> vec = new Vector<Integer>();
vec.add(1);
vec.add(3);
super.initVector("pids", vec, "PIDs beteiligter Prozesse");
super.initLong("timeout", 2500, "Zeit bis erneute Anfrage", "ms");
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientReset()
*/
public void onClientReset() {
if (pids != null) {
pids.clear();
pids.addAll(getVector("pids"));
}
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientStart()
*/
public void onClientStart() {
if (pids == null) {
pids = new ArrayList<Integer>();
pids.addAll(getVector("pids"));
}
if (pids.size() != 0) {
long timeout = getLong("timeout") + process.getTime();
/* Will run onClientSchedule() at the specified local time */
scheduleAt(timeout);
VSMessage message = new VSMessage();
message.setBoolean("isMulticast", true);
sendMessage(message);
}
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
*/
public void onClientRecv(VSMessage recvMessage) {
if (pids.size() != 0 && recvMessage.getBoolean("isAck")) {
Integer pid = recvMessage.getIntegerObj("pid");
if (pids.contains(pid))
pids.remove(pid);
else
return;
log("ACK from process " + pid + " received!");
if (pids.size() == 0) {
log("ACKs from all involved processes received!");
/* Remove the active schedule which has been created in the
onClientStart method */
removeSchedules();
}
}
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientSchedule()
*/
public void onClientSchedule() {
onClientStart();
}
/** True if ACK has been sent already */
private boolean ackSent;
/* (non-Javadoc)
* @see events.VSAbstractProtocol#onServerInit()
*/
public void onServerInit() {
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onServerReset()
*/
public void onServerReset() {
ackSent = false;
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
*/
public void onServerRecv(VSMessage recvMessage) {
if (recvMessage.getBoolean("isMulticast")) {
VSMessage message = new VSMessage();
message.setBoolean("isAck", true);
message.setInteger("pid", process.getProcessID());
sendMessage(message);
if (ackSent) {
log("ACK sent again");
} else {
log("ACK sent");
ackSent = true;
}
}
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onServerSchedule()
*/
public void onServerSchedule() {
}
}
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